Updating a daemonset, but "`selector` does not match template `labels`"

[Nate Rook]

So, I'm updating a daemonset to look like this:

apiVersion: extensions/v1beta1

kind: DaemonSet

metadata:

  name: sysdig-agent

spec:

  template:

    metadata:

      name: sysdig-agent

      labels:

        type: sysdig-agent

        class: infrastructure

        environment: staging

    spec:

      // ... 

But, I was surprised to get this error when I tried kubectl applying the update:

The DaemonSet "sysdig-agent" is invalid: spec.template.metadata.labels: Invalid value: {"class":"infrastructure","environment":"staging","type":"sysdig-agent"}: `selector` does not match template `labels`

I never actually created a selector, so I gather one is created implicitly. But I'm not sure what my implicit selector looks like, or why it disagrees with these labels.

I do see if I add a 'name' label to my pod template as well, everything works fine. But I'm not clear on why that is. Any ideas?

[Matthias Rampke]

If I recall correctly, the implicit selector is created from the daemonset metadata.

A daemonset needs a selector to function, so it knows which pods already exist. You are probably better off being explicit about it.

/MR

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